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3 Results

The results from the study are summarised in Table 1. The emission factor, in g/kg is obtained directly from measurements recorded by the portable emissions sampler. This gives the grams of particulate emissions per kilogram of fuel burned, with the fuel weight expressed on a dry weight basis. This is the same basis as is used in AS/NZS 4013 for laboratory measurements of particulate emissions.

Table 1: Summary of results for wood burners

Heater

Average emission rate (g/kg)

Fuel species

Fuel size/shape

Average moisture (%)

Pre-1994 heater replaced*

1

4.25

Pine

Small rounds

18

2

2

4.63

Pine

Split/off-cuts

17

3

3

11.21

Native

Split/off-cuts

40

n/a

4

4.22

Pine

Split

18

4

5

4.89

Pine

Split/off-cuts

17

n/a

6

2.97

Pine

Off-cuts

9.5

n/a

7

3.75

Pine

Split/off-cuts

16

9

8

2.33

Pine

Core rounds

12

11

9

3.63

Pine

Off-cuts

19

12

* This is the number of the heater from Appendix B (Environment Waikato, 2006), which describes the results of emissions tests on households participating in the Warm Homes Pilot Project before removal of their pre-1994 wood burner. Three of the homes selected for the present study were not participants in the Warm Homes Project.